fix: 修复多个关键问题

- 修复前端路由守卫：未登录时不显示提示，直接跳转登录页
- 修复API拦截器：401错误不显示提示，直接跳转
- 增强验证码显示：图片尺寸从120x40增加到200x80
- 增大验证码字体：从28号增加到48号
- 优化验证码字符：排除易混淆的0和1
- 减少干扰线：从5条减少到3条，添加背景色优化
- 增强登录API日志：添加详细的调试日志
- 增强验证码生成和验证日志
- 优化异常处理和错误追踪

影响文件：
- src/router/index.ts
- src/api/request.ts
- app/services/auth_service.py
- app/api/v1/auth.py
- app/schemas/user.py

测试状态：
- 前端构建通过
- 后端语法检查通过
- 验证码显示效果优化完成

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Makefile

@@ -0,0 +1,60 @@
+.PHONY: help install run test clean format lint db-migrate db-upgrade db-downgrade
+
+# 默认目标
+help:
+	@echo "可用命令:"
+	@echo "  make install     - 安装依赖"
+	@echo "  make run         - 启动开发服务器"
+	@echo "  make test        - 运行测试"
+	@echo "  make clean       - 清理缓存和临时文件"
+	@echo "  make format      - 格式化代码"
+	@echo "  make lint        - 代码检查"
+	@echo "  make db-migrate  - 创建数据库迁移"
+	@echo "  make db-upgrade  - 执行数据库迁移"
+	@echo "  make db-downgrade - 回滚数据库迁移"
+
+# 安装依赖
+install:
+	pip install -r requirements.txt
+
+# 启动开发服务器
+run:
+	python run.py
+
+# 运行测试
+test:
+	pytest tests/ -v --cov=app --cov-report=html
+
+# 清理缓存和临时文件
+clean:
+	find . -type d -name "__pycache__" -exec rm -rf {} +
+	find . -type f -name "*.pyc" -delete
+	find . -type f -name "*.pyo" -delete
+	find . -type f -name "*.pyd" -delete
+	rm -rf .pytest_cache
+	rm -rf htmlcov
+	rm -rf .mypy_cache
+	rm -rf .coverage
+
+# 格式化代码
+format:
+	black app/ tests/
+	isort app/ tests/
+
+# 代码检查
+lint:
+	flake8 app/ tests/
+	mypy app/
+
+# 创建数据库迁移
+db-migrate:
+	@read -p "请输入迁移描述: " desc; \
+	alembic revision --autogenerate -m "$$desc"
+
+# 执行数据库迁移
+db-upgrade:
+	alembic upgrade head
+
+# 回滚数据库迁移
+db-downgrade:
+	alembic downgrade -1